Power supply circuit and electronic device

Abstract

The present application relates to the technical field of circuits. Disclosed are a power supply circuit and an electronic device. The power supply circuit comprises a processing module, a first power source module and a voltage division module. A first end of the voltage division module is connected to an input end of the processing module; a second end of the voltage division module is connected to a feedback end of the first power source module; and a third end of the voltage division module is used for inputting a first voltage, wherein a voltage value of the second end of the voltage division module is positively correlated with a voltage value of the first end of the voltage division module, and the voltage value of the second end of the voltage division module is between the voltage value of the first end of the voltage division module and a voltage value of the third end of the voltage division module. The power supply circuit can reduce a reference voltage input by an input end of a processing module, so as to achieve the aim of reducing the waste of electric energy and improve the endurance capacity of an electronic device, thereby improving the user experience.

Description

Power supply circuit and electronic device TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a power supply circuit and an electronic device. BACKGROUND

[0002] Electronic devices include mobile phones, tablets and the like. Generally, electronic devices have a processing module and a power module. The processing module transmits a preset voltage value to the power module when powered on. The power module outputs a reference voltage to the input end of the processing module according to the preset voltage value after receiving the preset voltage value, thereby supplying power to the processing module. The feedback end of the power module is also connected to the input end of the processing module to detect the reference voltage input by the processing module, so that the value of the reference voltage input by the processing module is equal to the preset voltage value.

[0003] In the related art, the actual voltage input by the processing module when working is constantly fluctuating above and below the reference voltage, and the amplitude of the actual voltage relative to the reference voltage is related to the impedance in the power transmission process. Considering that the impedance in the power transmission process may be large, and in order to avoid the actual voltage input by the processing module when working being small, the reference voltage is usually a large voltage, that is, the preset voltage value is large.

[0004] However, in the case where the impedance in the power transmission process is optimized to be small, the processing module does not need to input a large reference voltage. However, the preset voltage value cannot be adjusted in the related art, so the reference voltage input by the processing module cannot be lowered, which causes waste of electric energy and is not conducive to the endurance of the electronic device.

[0005] SUMMARY

[0006] The embodiments of the present application provide a power supply circuit and an electronic device, which can lower the reference voltage input by the input end of the processing module, reduce the waste of electric energy, improve the endurance of the electronic device, and thus improve the user experience. The technical solution is as follows:

[0007] In a first aspect, a power supply circuit is provided. The power supply circuit is applied to an electronic device. The power supply circuit includes a processing module, a first power module and a voltage dividing module.

[0008] The communication end of the processing module is connected to the communication end of the first power module to transmit communication signals. The processing module is configured to transmit a communication signal indicating a preset voltage value to the first power module when powered on. The output end of the first power module is connected to the input end of the processing module, configured to output a reference voltage to the input end of the processing module, thereby supplying power to the processing module.

[0009] The first end of the voltage dividing module is connected with the input end of the processing module. The second end of the voltage dividing module is connected with the feedback end of the first power supply module. The third end of the voltage dividing module is used for inputting the first voltage. Here, the voltage value of the second end of the voltage dividing module is positively correlated with the voltage value of the first end of the voltage dividing module, and the voltage value of the second end of the voltage dividing module is constantly between the voltage value of the first end of the voltage dividing module and the voltage value of the third end of the voltage dividing module. That is, when the voltage of the third end of the voltage dividing module is greater than the voltage of the first end of the voltage dividing module, there is: the voltage of the third end of the voltage dividing module > the voltage of the second end of the voltage dividing module > the voltage of the first end of the voltage dividing module.

[0010] Since the first end of the voltage dividing module is connected with the input end of the processing module, the voltage of the first end of the voltage dividing module is equal to the voltage of the input end of the processing module. Since the second end of the voltage dividing module is connected with the feedback end of the first power supply module, the voltage of the second end of the voltage dividing module is equal to the voltage of the feedback end of the first power supply module. The voltage of the third end of the voltage dividing module is equal to the first voltage. Based on this, when the first voltage is greater than the voltage of the input end of the processing module, there is: the first voltage > the voltage of the feedback end of the first power supply module > the voltage of the input end of the processing module.

[0011] The first power supply module is used for adjusting the reference voltage output to the input end of the processing module according to the voltage of the feedback end of the first power supply module, so that the value of the voltage of the feedback end of the first power supply module is equal to the preset voltage value. Therefore, in the embodiment of the present application, in the case that the first voltage is greater than the voltage of the input end of the processing module, there is: when the value of the voltage of the feedback end of the first power supply module is equal to the preset voltage value, the value of the voltage of the input end of the processing module is less than the preset voltage value. In this way, the reduction of the reference voltage input by the input end of the processing module can be realized, the purpose of reducing the waste of electric energy is achieved, the endurance of the electronic device is improved, and the user experience is improved.

[0012] The power supply circuit provided by the embodiment of the present application can also be used to raise the reference voltage. Specifically, when the voltage value of the third end of the voltage dividing module is less than the voltage value of the first end of the voltage dividing module, there is: the voltage of the third end of the voltage dividing module < the voltage of the second end of the voltage dividing module < the voltage of the first end of the voltage dividing module. That is, when the first voltage is less than the voltage of the input end of the processing module, there is: the first voltage < the voltage of the feedback end of the first power supply module < the voltage of the input end of the processing module. In this case, there is: when the value of the voltage of the feedback end of the first power supply module is equal to the preset voltage value, the value of the voltage of the input end of the processing module is greater than the preset voltage value. In this way, the reference voltage input by the input end of the processing module can be raised.

[0013] The circuit structure of the power supply circuit provided by the embodiment of the present application will be explained in detail below.

[0014] In some embodiments, the voltage dividing module includes a first resistor and a second resistor. A first end of the first resistor is connected to the input end of the processing module, a second end of the first resistor is connected to a first end of the second resistor and the feedback end of the first power supply module, and a second end of the second resistor is configured to input the first voltage.

[0015] Generally, the resistance of the first resistor is much smaller than the resistance of the second resistor. In this way, the voltage at the feedback end of the first power supply module is closer to the voltage at the input end of the processing module, i.e., the value of the reference voltage input at the input end of the processing module is closer to the preset voltage value, which can avoid the value of the reference voltage deviating from the preset voltage value too much and affecting the stability of the system. In some specific embodiments, the resistance of the first resistor is greater than or equal to 10 ohms and less than or equal to 100 ohms. For example, the resistance of the first resistor can be 10 ohms, 50 ohms or 100 ohms. The resistance of the second resistor is greater than or equal to 1 kilo-ohm. For example, the resistance of the second resistor can be 1 kilo-ohm, 1.5 kilo-ohm, 5 kilo-ohm or 10 kilo-ohm.

[0016] In some embodiments, the power supply circuit further includes a second power supply module. An input end of the second power supply module is configured to input a second voltage. An output end of the second power supply module is connected to the third end of the voltage dividing module to output the first voltage to the third end of the voltage dividing module. That is, the second power supply module is configured to convert the second voltage into the first voltage and output the first voltage to the third end of the voltage dividing module.

[0017] In some specific embodiments, the second power supply module includes a linear voltage regulator. In other embodiments, the second power supply module can also be a direct current voltage converter, etc.

[0018] In some embodiments, the power supply circuit further includes a first switch module. A first end of the first switch module is configured to input the second voltage, and a second end of the first switch module is connected to the input end of the second power supply module. That is, by controlling the conduction and non-conduction of the first switch module, whether the second power supply module inputs the second voltage can be controlled.

[0019] In some specific embodiments, the first switch module includes a first transistor and a third resistor. A first pole of the first transistor is configured to input the second voltage, and a second pole of the first transistor is connected to the input end of the second power supply module. A first end of the third resistor is connected to the first pole of the first transistor, and a second end of the third resistor is connected to the control pole of the first transistor.

[0020] Further, the first transistor can be a P-type transistor which is low-level on and high-level off. Based on this, the first switch module can further include a second transistor and a fourth resistor. The first pole of the second transistor is connected with the control pole of the first transistor, and the second pole of the second transistor is connected with the ground wire. The second transistor is an N-type transistor which is low-level off and high-level on. The first end of the fourth resistor is connected with the second pole of the second transistor, and the second end of the fourth resistor is connected with the control pole of the second transistor.

[0021] In some embodiments, the power supply circuit further includes a first capacitor. The first capacitor is a voltage stabilizing capacitor. The first pole of the first capacitor is connected with the first end of the first switch module, and the second pole of the first capacitor is connected with the ground wire. Here, the first capacitor is also connected with the input end of the second power supply module through the first switch module, which can ensure that the input end of the second power supply module enters the suspended state immediately when the first switch module is off, without being affected by the first capacitor.

[0022] In some embodiments, the power supply circuit further includes a second capacitor. The second capacitor is a voltage stabilizing capacitor. The first pole of the second capacitor is connected with the output end of the second power supply module, and the second pole of the second capacitor is connected with the ground wire.

[0023] In some embodiments, the power supply circuit further includes a second switch module. The first end of the second switch module is connected with the output end of the second power supply module, and the second end of the second switch module is connected with the third end of the voltage division module. The second switch module can cut off the path between the output end of the second power supply module and the third end of the voltage division module. In this way, when the second power supply module does not work and the second switch module is off, a path cannot be formed between the third end of the voltage division module and the ground wire to which the output end of the second power supply module is connected, thereby avoiding energy waste.

[0024] In some specific embodiments, the second switch module includes a third transistor and a fifth resistor. The first pole of the third transistor is connected with the output end of the second power supply module, and the second pole of the third transistor is connected with the third end of the voltage division module. The first end of the fifth resistor is connected with the first pole of the third transistor, and the second end of the fifth resistor is connected with the control pole of the third transistor.

[0025] In some embodiments, the output end of the first power supply module includes a plurality of sub-ports. The power supply circuit further includes a plurality of inductors. The plurality of inductors correspond to the plurality of sub-ports one by one. The first end of any one of the plurality of inductors is connected with the corresponding sub-port, and the second end of each of the plurality of inductors is connected with the input end of the processing module. In this way, the first power supply module can supply power to the processing module through the plurality of inductors.

[0026] In some embodiments, the power supply circuit further comprises a power distribution network. A first end of the power distribution network is connected to the output end of the first power module, and a second end of the power distribution network is connected to the input end of the processing module. The first power module supplies power to the processing module through the power distribution network.

[0027] In a second aspect, an electronic device is provided, which comprises the power supply circuit according to any one of the first aspect.

[0028] It can be understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a schematic diagram of the appearance of a first electronic device in the related art;

[0030] FIG. 2 is a schematic diagram of the appearance of a second electronic device in the related art;

[0031] FIG. 3 is a circuit structure diagram of a first power supply circuit in the related art;

[0032] FIG. 4 is a circuit structure diagram of a second power supply circuit in the related art;

[0033] FIG. 5 is a waveform diagram of the actual voltage input by the first processing module in the related art;

[0034] FIG. 6 is a waveform diagram of the actual voltage input by the second processing module in the related art;

[0035] FIG. 7 is a waveform diagram of the actual voltage input by the processing module after the reference voltage is adjusted in the related art;

[0036] FIG. 8 is a voltage comparison diagram before and after the reference voltage is adjusted in the related art;

[0037] FIG. 9 is a circuit structure diagram of the first power supply circuit provided by the embodiments of the present application;

[0038] FIG. 10 is a circuit structure diagram of the second power supply circuit provided by the embodiments of the present application;

[0039] FIG. 11 is a current direction diagram of the first power supply circuit provided by the embodiments of the present application;

[0040] FIG. 12 is a current direction diagram of the second power supply circuit provided by the embodiments of the present application;

[0041] FIG. 13 is a circuit structure diagram of a third power supply circuit provided by the embodiments of the present application;

[0042] FIG. 14 is a circuit structure diagram of a fourth power supply circuit provided by the embodiments of the present application;

[0043] Fig. 15 is an equivalent circuit diagram of a power supply circuit according to an embodiment of the present application;

[0044] Fig. 16 is a circuit structure diagram of a fifth power supply circuit according to an embodiment of the present application;

[0045] Fig. 17 is a circuit structure diagram of a first switch module according to an embodiment of the present application;

[0046] Fig. 18 is a circuit structure diagram of a second switch module according to an embodiment of the present application;

[0047] Fig. 19 is a circuit structure diagram of a sixth power supply circuit according to an embodiment of the present application;

[0048] Fig. 20 is a circuit structure diagram of a seventh power supply circuit according to an embodiment of the present application;

[0049] Fig. 21 is a circuit structure diagram of an eighth power supply circuit according to an embodiment of the present application;

[0050] Fig. 22 is a circuit structure diagram of a first switch module according to an embodiment of the present application;

[0051] Fig. 23 is a circuit structure diagram of a second switch module according to an embodiment of the present application;

[0052] Fig. 24 is a circuit structure diagram of a ninth power supply circuit according to an embodiment of the present application;

[0053] Fig. 25 is a circuit structure diagram of a tenth power supply circuit according to an embodiment of the present application.

[0054] In the related art, the meanings of the respective reference numerals are as follows: 10, electronic device; 100, power supply circuit; 110, processing module; 120, power supply module;

[0055] In the embodiments of the present application, the meanings of the respective reference numerals are as follows: 20, power supply circuit; 210, processing module; 220, first power supply module; 230, voltage dividing module; 240, second power supply module; 250, first switch module; 252, first switch unit; 254, first level conversion unit; 260, second switch module; 262, second switch unit; 264, second level conversion unit. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0057] It should be understood that the "multiple" mentioned in the present application refers to two or more than two. In the description of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. In addition, in order to clearly describe the technical solutions of the present application, the same items or similar items with basically the same functions and roles are distinguished by using "first", "second" and the like. Those skilled in the art can understand that "first", "second" and the like do not limit the quantity and execution order, and "first", "second" and the like do not necessarily mean different.

[0058] Before the power supply circuit provided by the embodiments of the present application is explained in detail, the application scenarios and related technologies of the power supply circuit are described.

[0059] The electronic device 10 includes a mobile phone, a tablet computer, a notebook computer, a television, a wearable device, etc. FIG. 1 and FIG. 2 are schematic diagrams of the appearances of two different electronic devices 10 in the related art. The electronic device 10 shown in FIG. 1 is a notebook computer, and the electronic device 10 shown in FIG. 2 is a mobile phone. Generally, the electronic device 10 has a processor. The processor can work with power on, and the processor can process data when working. For example, in the electronic device 10 such as a mobile phone, a tablet computer, and a wearable device, the processor is generally a system on chip (SOC). The SOC includes a central processing unit (CPU), a graphics processing unit (GPU), a baseband processor, etc. which are integrated together. In the electronic device 10 such as a notebook computer and a television, the processor includes a CPU, a GPU, etc. which are respectively arranged and connected together.

[0060] Taking the electronic device 10 as a mobile phone and the processor as a SOC as an example, the SOC generally has a plurality of processor cores (hereinafter referred to as cores). For example, the plurality of cores of the SOC can include performance cores, efficiency cores, counting register cores, storage cores, display cores, and the like. Among them, the performance core is also called a large core, and the efficiency core is also called a small core. The counting register core is used as a counter in instructions such as loops and string operations. The storage core is used for data storage. The display core is used for image operation work. It is found through analysis of the power consumption model of the mobile phone that the power consumption of the SOC accounts for about 45% of the entire electronic device 10; and in the SOC of the mobile phone, the power consumption of the performance core, the efficiency core, the counting register core, the storage core, and the display core accounts for about 80% of the SOC. As can be seen, reducing the power consumption of each core in the SOC is of great significance to reducing the power consumption of the mobile phone and improving the endurance of the mobile phone. It is found through research that if the average power consumption of each core in the performance core, the efficiency core, the counting register core, the storage core, and the display core of the SOC is reduced by 5%, the power consumption of the SOC can be reduced by at least 4%, and at this time the endurance of the mobile phone can be improved by 2% to 3%.

[0061] It can be understood that for any core in the SOC, the power consumption of the core can be calculated by the following formula: P = f · C · V 2 .

[0062] Wherein, p is the power consumption of the core. f is the working frequency of the core. For example, f can be equal to 3GHz (gigahertz) or 2.5GHz, etc. C is the equivalent capacitance of the core, and V is the actual voltage input when the core works.

[0063] As can be seen, by reducing the actual voltage input when the core in the SOC works, the purpose of reducing the power consumption of the core can be achieved, thereby improving the endurance of the mobile phone.

[0064] Similarly, when the electronic device 10 is a notebook computer, a television, etc., and the processor of the electronic device 10 is a CPU, a GPU, etc., the CPU and the GPU also include a plurality of cores. In this case, reducing the actual voltage input when the core in the CPU and the GPU works can also reduce the power consumption of the core, thereby reducing the power consumption of the CPU and achieving the purpose of reducing the power consumption of the electronic device 10.

[0065] The feasibility of "reducing the actual voltage input when the core in the SOC (or CPU, GPU, etc.) works" will be described below. For ease of understanding, in the following description, the "core" is referred to as a processing module of the electronic device 10. That is, the processing module can be any core in the SOC, or any core in the CPU, the GPU, etc.

[0066] The electronic device 10 has a power supply circuit 100 including a processing module 110. FIG. 3 is a circuit structure diagram of a power supply circuit 100 in the related art. As shown in FIG. 3, the power supply circuit 100 further includes a power supply module 120. The communication end a of the processing module 110 is connected with the communication end c of the power supply module 120. The output end d of the power supply module 120 is connected with the input end b of the processing module 110. The feedback end e of the power supply module 120 is connected with the input end b of the processing module 110.

[0067] The working process of the processing module 110 is as follows: the processing module 110 transmits a preset voltage value to the power supply module 120 through the communication end a when powered on. The input end b of the processing module 110 is used to input electric energy.

[0068] The working process of the power supply module 120 is as follows: the power supply module 120 outputs electric energy from the output end d to the input end b of the processing module 110 when receiving the preset voltage value, thereby supplying power to the processing module 110. Meanwhile, the feedback end e of the power supply module 120 can also detect the reference voltage input by the input end b of the processing module 110. The power supply module 120 is configured to make the voltage value of the feedback end e equal to the preset voltage value. In the related art, this can make the value of the reference voltage input by the processing module 110 equal to the preset voltage value.

[0069] Generally, as shown in FIG. 4, the power supply module 120 is internally provided with a series connection of a resistor Ra and a resistor Rb. The resistor Ra and the resistor Rb are voltage division sampling resistors, and the resistor Ra and the resistor Rb are connected in series between the feedback end e and the ground wire. For ease of description, the node connected with the resistor Ra and the resistor Rb is referred to as node A. When the power supply module 120 is working, the voltage value of the node A can be detected, and the voltage value of the feedback end e can be obtained according to the voltage value of the node A and the resistance ratio of the resistor Ra and the resistor Rb.

[0070] In the related art, the actual voltage input by the processing module 110 when working is constantly fluctuating above and below the reference voltage. The reason is that, as shown in FIG. 4, the output end d of the power supply module 120 and the input end b of the processing module 110 are connected through a power delivery network (PDN). The PDN has a certain impedance. When the processing module 110 works, it will draw a load current, and the load current drawn by the processing module 110 is an alternating current with a non-constant current value related to the working frequency of the processing module 110. Thus, according to Ohm's law, in the positive half cycle of the alternating current, the actual voltage input by the processing module 110 when working will be greater than the reference voltage; in the negative half cycle of the alternating current, the actual voltage input by the processing module 110 when working will be less than the reference voltage. The amplitude of the actual voltage input by the processing module 110 relative to the reference voltage is related to the impedance in the power transmission process, that is, the PDN impedance. In this case, the waveform of the actual voltage input by the processing module 110 can be as shown in FIG. 5. In the embodiment shown in FIG. 5, Vdd1 represents the preset voltage value, that is, the value of the reference voltage in the related art.

[0071] Based on this, the first voltage threshold Vth1 and the second voltage threshold Vth2 are also provided in the processing module 110. Generally, the second voltage threshold Vth2 is greater than the preset voltage value Vdd1, and the preset voltage value Vdd1 is greater than the first voltage threshold Vth1. The processing module 110 needs to meet the following condition when working normally: the actual voltage input by the input end b is always between the first voltage threshold Vth1 and the second voltage threshold Vth2. When the actual voltage input by the processing module 110 is less than the first voltage threshold Vth1, it can cause the actual voltage input by the processing module 110 to be too low to work, thereby causing the electronic device 10 to crash. Therefore, the function of the first voltage threshold Vth1 is to limit the minimum value of the actual voltage input by the processing module 110. When the actual voltage input by the processing module 110 is greater than the second voltage threshold Vth2, it can cause the processing module 110 to be damaged. Therefore, the function of the second voltage threshold Vth2 is to limit the maximum value of the actual voltage input by the processing module 110. In the related art, considering that the PDN impedance can be large, that is, the amplitude of the actual voltage input by the processing module 110 relative to the reference voltage is large, and in order to ensure that the actual voltage input by the processing module 110 is always between the first voltage threshold Vth1 and the second voltage threshold Vth2, the reference voltage is usually a large voltage, that is, the preset voltage value Vdd1 is large.

[0072] However, when the PDN impedance is optimized to be small, the waveform of the actual voltage input by the processing module 110 can change from that shown in FIG. 5 to that shown in FIG. 6. As shown in FIG. 6, when the PDN impedance is small, the minimum value of the actual voltage input by the processing module 110 is much greater than the first voltage threshold Vth1. As described above, when the processing module 110 is working, the actual voltage input only needs to satisfy that it is always between the first voltage threshold Vth1 and the second voltage threshold Vth2. Therefore, in this case, the reference voltage can be lowered, and the value of the reference voltage is reduced to Vdd2. After the reference voltage is lowered, the waveform of the actual voltage input by the processing module 110 is as shown in FIG. 7. As shown in FIG. 7, after the reference voltage is lowered, the actual voltage input by the processing module 110 can still ensure that the processing module 110 works normally. FIG. 8 shows a comparison of the voltages before and after the reference voltage is lowered. As shown in FIGS. 6-8, when the PDN impedance is optimized, the actual voltage input by the processing module 110 can be reduced by lowering the reference voltage, so as to reduce the power consumption of the processing module 110 and improve the endurance of the electronic device 10.

[0073] It is easy to understand that the PDN is usually composed of wires, capacitors, inductors and other electronic devices. Therefore, by optimizing the wiring form of the wires, the connection mode of the electronic devices and the material of the electronic devices in the PDN, the PDN can be optimized, and the purpose of reducing the PDN impedance can be achieved. In fact, in the related art, the PDN impedance has been well optimized. For example, Table 1 below shows the simulation data of the PDN impedance before and after optimization of different processing modules 110 in the related art.

[0074] Table 1

[0075] In Table 1, NO1, NO2, NO3, NO4 and NO5 are the numbers of different processing modules 110. The processing module 110 numbered NO1 is a performance core; the processing module 110 numbered NO2 is an energy efficiency core; the processing module 110 numbered NO3 is a counting register core; the processing module 110 numbered NO4 is a storage core; and the processing module 110 numbered NO5 is a display core. “Low frequency”, “medium frequency” and “high frequency” are the working frequencies of the processing modules 110. The impedance units are the same, and are all mΩ (milliohms). As shown in Table 1, the PDN impedance can be well optimized in the related art. Based on this, if the reference voltage can be lowered, the power consumption of the processing module 110 can be reduced, and the endurance of the electronic device 10 can be improved.

[0076] In the related art, to reduce the reference voltage input by the processing module 110, the conventional idea is to reduce the preset voltage value Vdd1, for example, to reduce the preset voltage value Vdd1 to Vdd2. However, changing the preset voltage value Vdd1 requires modifying the underlying code of the processing module 110. Since the underlying code of the processing module 110 cannot be modified, the preset voltage value Vdd1 cannot be adjusted in the related art, so the reference voltage input by the processing module 110 cannot be lowered, which causes waste of electrical energy and is not conducive to the endurance of the electronic device 10.

[0077] Therefore, an embodiment of the present application provides a power supply circuit and an electronic device, which can lower the reference voltage input by the input end of the processing module, reduce the waste of electrical energy, improve the endurance of the electronic device, and thus improve the user experience.

[0078] The power supply circuit provided by an embodiment of the present application will be explained and described in detail below. In the embodiment of the present application, the connection between two electrical modules / electronic devices includes communication connection and electrical connection. The communication connection here refers to a connection capable of communication signal transmission. The communication signal can be an electrical signal or an optical signal, which is not limited here. The electrical connection refers to a connection capable of electrical signal transmission. The electrical connection includes direct connection and indirect connection. For example, the direct connection of A device and B device means that A device and B device are connected by a wire to transmit electrical signals. The indirect connection of A device and B device means that A device and C device are connected by a wire between the first end of C device and B device, so that A device and B device can transmit electrical signals through C device. For the convenience of understanding, in the following description, the "electrical connection" is referred to as connection.

[0079] The power supply circuit 20 is applied to an electronic device, for example, to the electronic device shown in FIG. 1 or FIG. 2. FIG. 9 is a circuit structure diagram of a power supply circuit 20 provided by an embodiment of the present application. As shown in FIG. 9, the power supply circuit 20 includes a processing module 210, a first power supply module 220, and a voltage dividing module 230.

[0080] The electronic device includes a processor. For example, when the electronic device is a mobile terminal such as a mobile phone, a tablet computer, a wearable device, etc., the processor can be a SOC. When the electronic device is a device such as a personal computer (PC), a television, a server, etc., the processor can be a CPU, a GPU, etc. The processor generally has a plurality of cores, and different cores can have the same or different working frequencies and functions. Here, the processing module 210 can be any one core in the processor. The processing module 210 has a communication end a and an input end b. The communication end a of the processing module 210 is used to transmit a communication signal. The input end b of the processing module 210, also referred to as a power end, is used to input electric energy, so that the processing module 210 can work in an energized state. The processing module 210 realizes its data processing function when working.

[0081] The first power module 220 is a device used for direct current voltage conversion in the electronic device. For example, the first power module 220 can be a power management integrated circuit (PMIC) or a voltage regulator module (VRM), etc. The first power module 220 has a communication end c, an output end d, and a feedback end e. The communication end c of the first power module 220 is in communication connection with the communication end a of the processing module 210, and is used to transmit a communication signal. For example, the communication end c of the first power module 220 and the communication end a of the processing module 210 can be connected through at least one of an inter integrated circuit (I2C) bus, a serial peripheral management interface (SPMI) bus, a serial voltage identification (SVID) bus, a serial peripheral interface (SPI) bus, etc., to realize the transmission of the communication signal. The output end d of the first power module 220 is connected with the input end b of the processing module 210, and is used to supply power to the processing module 210.

[0082] The voltage of the first end of the voltage dividing module 230 is referred to as V1, the voltage of the input end b of the processing module 210 is referred to as Vb, the voltage of the second end 2 of the voltage dividing module 230 is referred to as V2, the voltage of the feedback end e of the first power supply module 220 is referred to as Ve, and the voltage of the third end 3 of the voltage dividing module 230 is referred to as V3. Then, V1=Vb, V2=Ve, and V3=VA.

[0083] The voltage of the first end of the voltage dividing module 230 is referred to as V1, the voltage of the input end b of the processing module 210 is referred to as Vb, the voltage of the second end 2 of the voltage dividing module 230 is referred to as V2, the voltage of the feedback end e of the first power supply module 220 is referred to as Ve, and the voltage of the third end 3 of the voltage dividing module 230 is referred to as V3. Then, V1=Vb, V2=Ve, and V3=VA.

[0084] V1=Vb; V2=Ve; V3=VA … ①.

[0085] The voltage of the second end 2 of the voltage dividing module 230 is positively correlated with the voltage of the first end 1 of the voltage dividing module 230, and the voltage of the second end 2 of the voltage dividing module 230 is always between the voltage of the first end 1 of the voltage dividing module 230 and the voltage of the third end 3 of the voltage dividing module 230. That is, V2∝V1.

[0086] V2∝V1.

[0087] When V3>V1, V3>V2>V1 … ②.

[0088] When V3

[0089] Combining the above formula ① and formula ②, we can obtain:

[0090] When VA>Vb, VA=V3>V2=Ve>V1=Vb … ④.

[0091] Combining the above formula ① and formula ③, we can obtain:

[0092] When VA

[0093] In the embodiment of the present application, the working process of the processing module 210 is as follows: the processing module 210 transmits a first communication signal to the first power module 220 through the communication end a when powered on. The first communication signal is used to indicate a preset voltage value, that is, the first communication signal contains the preset voltage value. The input end b of the processing module 210 is used to input electric energy. The working process of the first power module 220 is as follows: when the preset voltage value is received, the first power module 220 outputs a reference voltage from the output end d to the input end b of the processing module 210, thereby supplying power to the processing module 210; in the process of supplying power to the processing module 210, the reference voltage output to the input end b of the processing module 210 is adjusted according to the voltage of the feedback end e of the first power module 220, so that the value of the voltage of the feedback end e of the first power module 220 is equal to the preset voltage value.

[0094] In the embodiment of the present application, the power-on of the processing module 210 is not the same as the input of electric energy to the input end b of the processing module 210. The power-on of the processing module 210 refers to the power-on of other ports of the processing module 210 that are not shown, so that the processing module 210 is ready to start working. Generally, after the power-on of the processing module 210, a series of initialization operations can be performed, such as checking the hardware state, loading program code, etc. In some specific embodiments, the processing module 210 can be powered on when the electronic device is started. The input of electric energy to the input end b of the processing module 210 refers to the power supply from the output end d of the first power module 220 to the input end b of the processing module 210. After the input of electric energy to the input end b of the processing module 210, the processing module 210 can perform data processing at a working frequency. It can be understood that the embodiment of the present application does not involve improvement of the processing module 210 relative to the prior art. Therefore, the preset voltage value in the embodiment of the present application is equal to the preset voltage value in the related art, and the working process of the processing module 210 in the embodiment of the present application is also the same as that in the related art.

[0095] The reference voltage refers to the voltage of the input end b of the processing module 210 when the output end d of the first power module 220 supplies power to the input end b of the processing module 210 and the processing module 210 does not perform AC load drawing. It can be understood that, compared with the value of the reference voltage, the actual voltage input when the processing module 210 performs AC load drawing is relatively small in amplitude relative to the reference voltage. For example, the value of the reference voltage can be 1V (volt), and the amplitude of the actual voltage relative to the reference voltage can be 10mV (millivolt). The first power module 220 adjusts the output voltage of the output end d, thereby achieving the purpose of adjusting the reference voltage of the input end b of the processing module 210. It can be understood that the embodiment of the present application does not involve improvement of the power module 120 relative to the prior art. Therefore, the working process of the first power module 220 in the embodiment of the present application is the same as that of the power module 120 in the related art.

[0096] In the embodiment of the present application, the first power module 220 adjusts the reference voltage output to the input terminal b of the processing module 210 according to the voltage of the feedback terminal e, and finally makes the value of the voltage of the feedback terminal e of the first power module 220 equal to the preset voltage value. In combination with the above formula (IV), it can be obtained that, in the case that the first voltage VA is greater than the voltage of the input terminal b of the processing module 210, there will be:

[0097] VA = V3 > V2 = Ve = preset voltage value > V1 = Vb. That is, when the value of the voltage of the feedback terminal e of the first power module 220 is equal to the preset voltage value, the value of the voltage of the input terminal b of the processing module 210 is less than the preset voltage value. In this way, by the setting of the voltage dividing module 230, the reduction of the reference voltage input by the input terminal b of the processing module 210 can be realized, the purpose of reducing the waste of electric energy is achieved, the endurance of the electronic device is improved, and thus the user experience is improved.

[0098] It can be understood that, as known from the foregoing description, the voltage of the input terminal b of the processing module 210 fluctuates up and down when the processing module 210 works. Based on this, when it is needed to reduce the reference voltage input by the input terminal b of the processing module 210, the first voltage VA should be set to be always greater than the voltage of the input terminal b of the processing module 210. For example, if the value of the reference voltage before being reduced is 1V, and the actual voltage input by the processing module 210 when working has an amplitude of 10mV relative to the reference voltage, the first voltage VA can be set to be 2V or 3V. In this way, the first voltage VA can be set to be always greater than the voltage of the input terminal b of the processing module 210, so that the value of the reference voltage is reduced to be less than 1V.

[0099] In some other embodiments, the power supply circuit 20 can also be used to raise the reference voltage.

[0100] Specifically, in the embodiment of the present application, the first power module 220 adjusts the reference voltage output to the input terminal b of the processing module 210 according to the voltage of the feedback terminal e, and finally makes the value of the voltage of the feedback terminal e of the first power module 220 equal to the preset voltage value. In combination with the above formula (V), it can be obtained that, in the case that the first voltage VA is less than the voltage of the input terminal b of the processing module 210, there will be:

[0101] VA=V3<V2=Ve=the preset voltage value<V1=Vb. That is, when the value of the voltage at the feedback end e of the first power supply module 220 is equal to the preset voltage value, the value of the voltage at the input end b of the processing module 210 is greater than the preset voltage value. In this way, by setting the voltage dividing module 230, the reference voltage input by the input end b of the processing module 210 can be raised. For the processing module 210 that cannot work due to the actual voltage input by the input end b being less than the first voltage threshold Vth1 during work, raising the reference voltage can ensure the normal work of the processing module 210, avoid the application electronic device of the power supply circuit 20 from being dead, and thus improve the user experience.

[0102] Therefore, it can be seen that the power supply circuit 20 provided by the embodiment of the present application can realize the lowering of the reference voltage input by the input end b of the processing module 210 when the first voltage VA input by the third end 3 of the voltage dividing module 230 is greater than the voltage at the input end b of the processing module 210. Conversely, the power supply circuit 20 provided by the embodiment of the present application can realize the raising of the reference voltage input by the input end b of the processing module 210 when the first voltage VA input by the third end 3 of the voltage dividing module 230 is less than the voltage at the input end b of the processing module 210.

[0103] FIG. 10 is a circuit structure diagram of another power supply circuit 20 provided by the embodiment of the present application. As shown in FIG. 10, in some embodiments, the power supply circuit 20 further includes a PDN.

[0104] The PDN is used to distribute the electric energy output by the output end d of the first power supply module 220 to other power-consuming devices (such as the processing module 210) in the electronic device. The PDN can be composed of wires, capacitors, inductors and other electronic devices. Here, the PDN has a first end and a second end. The first end of the PDN is connected with the output end d of the first power supply module 220, and the second end of the PDN is connected with the input end b of the processing module 210. The first power supply module 220 supplies power to the processing module 210 through the PDN.

[0105] The circuit structure of the power supply circuit 20 provided by the embodiment of the present application will be explained in detail below with reference to the accompanying drawings.

[0106] I. Circuit structure of the voltage dividing module 230.

[0107] As shown in FIG. 10, the voltage dividing module 230 includes a first resistor R1 and a second resistor R2. A first end of the first resistor R1 is connected to the input end b of the processing module 210. That is, the first end of the first resistor R1 is the first end 1 of the voltage dividing module 230. A second end of the first resistor R1 is connected to a first end of the second resistor R2 and the feedback end e of the first power supply module 220. That is, the second end of the first resistor R1 and the first end of the second resistor R2 form the second end 2 of the voltage dividing module 230. A second end of the second resistor R2 is used to input the first voltage VA. That is, the second end of the second resistor R2 is the third end 3 of the voltage dividing module 230.

[0108] It can be understood that, in some other embodiments not shown, the first resistor R1 and the second resistor R2 can be formed by one or more resistors in series or in parallel. Here, the plurality of refers to two or more integers. It can be understood that, in some other embodiments, the voltage dividing module 230 can also include capacitors, inductors, and the like.

[0109] In the embodiments of the present application, the resistance value of the first resistor R1 can be set to be much smaller than the resistance value of the second resistor R2. The purpose of this setting is to make the voltage of the feedback end e of the first power supply module 220 close to the voltage of the input end b of the processing module 210. Since the voltage of the feedback end e when the first power supply module 220 is working is equal to the preset voltage value, that is, the reference voltage input by the input end b of the processing module 210 is close to the preset voltage value, which can avoid the reference voltage deviating from the preset voltage value too much and affecting the stability of the system. The following will analyze and illustrate this in two cases.

[0110] 1. The first case: the first voltage VA is greater than the voltage of the input end b of the processing module 210, that is, VA>Vb.

[0111] FIG. 11 is a current direction diagram of the power supply circuit 20 according to an embodiment of the present application, which shows the current direction in the power supply circuit 20 when VA>Vb. In this case, V3>V2>V1, and V2 can be calculated by the following formula:

[0112] wherein I1 is the current value of the first resistor R1, R1 is the resistance value of the first resistor R1, and R2 is the resistance value of the second resistor R2. The following will illustrate the size relationship between V1 and V2 by way of example.

[0113] (1) In the first example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ, which meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming that the voltage of the input end b of the processing module 210 is 1V, and the first voltage VA is 3V, then V1=Vb=1V, and V3=VA=3V. According to the above formula, the voltage of the second end 2 of the voltage dividing module 230 is:

[0114] Therefore, the voltage of the feedback end e of the first power supply module 220 is 1.0198V, and the voltage of the input end b of the processing module 210 is 1V. Thus, the voltage of the feedback end e of the first power supply module 220 is 19.8mV larger than the voltage of the input end b of the processing module 210, i.e., the reference voltage is reduced by 19.8mV. The voltage of the feedback end e of the first power supply module 220 is closer to the voltage of the input end b of the processing module 210.

[0115] (2) In the second example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ, which meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming that the preset voltage value is 1V, and the first voltage VA is 3V, then Ve=V2=1V, and V3=VA=3V. According to the above formula, at this time,

[0116] Accordingly, V1=0.98V.

[0117] Therefore, the voltage of the feedback end e of the first power supply module 220 is 20mV larger than the voltage of the input end b of the processing module 210, i.e., the reference voltage is reduced by 20mV. The voltage of the feedback end e of the first power supply module 220 is closer to the voltage of the input end b of the processing module 210.

[0118] 2. The second case: the first voltage VA is smaller than the voltage of the input end b of the processing module 210, i.e., VA

[0119] FIG. 12 is a current direction diagram of another power supply circuit 20 provided by an embodiment of the present application, which shows the current direction in the power supply circuit 20 when VA

[0120] The size relationship between V1 and V2 is described below by way of example.

[0121] (1) In the first example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ, which meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming that the voltage of the input end b of the processing module 210 is 1V, and the first voltage VA is 0.5V, then V1 = Vb = 1V, and V3 = VA = 0.5V. According to the above formula, the voltage of the second end 2 of the voltage dividing module 230 at this time is:

[0122] Therefore, the voltage of the feedback end e of the first power supply module 220 at this time is 0.99505V, i.e. 995.05mV, and the voltage of the input end b of the processing module 210 is 1V. Therefore, the voltage of the feedback end e of the first power supply module 220 is 4.95mV smaller than the voltage of the input end b of the processing module 210, i.e. the reference voltage is raised by 4.95mV. The voltage of the feedback end e of the first power supply module 220 is closer to the voltage of the input end b of the processing module 210.

[0123] (2) In the second example, the resistance of the first resistor R1 is 100Ω, and the resistance of the second resistor R2 is 10KΩ, which meets the requirement that the resistance of the first resistor R1 is much smaller than the resistance of the second resistor R2. In this example, assuming that the preset voltage value is 1V, and the first voltage VA is 0.5V, then Ve = V2 = 1V, and V3 = VA = 0.5V. According to the above formula, at this time:

[0124] Accordingly, V1 = 1.005.

[0125] Therefore, when the voltage of the feedback end e of the first power supply module 220 is 1V, the voltage of the input end b of the processing module 210 is 1.005V. Therefore, the voltage of the feedback end e of the first power supply module 220 is 5mV smaller than the voltage of the input end b of the processing module 210, i.e. the reference voltage is raised by 5mV. The voltage of the feedback end e of the first power supply module 220 is closer to the voltage of the input end b of the processing module 210.

[0126] According to the above analysis and examples, the value of the reference voltage being reduced or raised is related to the resistance value of the first resistor R1, the resistance value of the second resistor R2, and the value of the first voltage VA. In some specific embodiments, the resistance value of the first resistor R1 is greater than or equal to 10Ω, and the resistance value of the first resistor R1 is less than or equal to 100Ω. For example, the resistance value of the first resistor R1 can be 10Ω, 50Ω, or 100Ω. The resistance value of the second resistor R2 is greater than or equal to 1KΩ. For example, the resistance value of the second resistor R2 can be 1KΩ, 1.5KΩ, 5KΩ, 10KΩ, or 20KΩ. In some preferred embodiments, the resistance value of the first resistor R1 is 50Ω, and the resistance value of the second resistor R2 is 10KΩ. The resistance value of the first resistor R1, the resistance value of the second resistor R2, and the value of the first voltage VA can be set by those skilled in the art according to experience and needs.

[0127] II. Circuit structure of the second power supply module 240 for providing the first voltage VA.

[0128] FIG. 13 is a circuit structure diagram of another power supply circuit 20 provided by the embodiments of the present application. As shown in FIG. 13, in some embodiments, the power supply circuit 20 further includes a second power supply module 240.

[0129] The second power supply module 240 is a device for converting direct current voltage in an electronic device. The second power supply module 240 is used to provide the first voltage VA. The second power supply module 240 has an input end f and an output end g. The input end f of the second power supply module 240 is used to input a second voltage VB. Here, the second voltage VB can be provided by an energy storage unit in the electronic device. When the electronic device is a mobile phone, a tablet computer, or a wearable device, the energy storage unit can be a battery in the electronic device; when the electronic device is a PC, etc., the energy storage unit can be a battery on board (BOB) in the electronic device. The output end g of the second power supply module 240 is connected to the third end 3 of the voltage dividing module 230. The second power supply module 240 is used to convert the direct current second voltage VB into the first voltage VA, and provide the first voltage VA to the third end 3 of the voltage dividing module 230.

[0130] In some embodiments, the second power module 240 can be a linear regulator, as shown in FIG. 14. For example, the second power module 240 can be a low dropout regulator (LDO) to provide the third terminal 3 of the voltage dividing module 230 with a stable and low ripple first voltage VA. When the second power module 240 is a linear regulator, the second power module 240 can also have an enable terminal h and a communication terminal i. The enable terminal h of the second power module 240 can also be referred to as an enable input terminal. When a high level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters an active state and can convert the second voltage VB into the first voltage VA. Conversely, when a low level signal is input to the enable terminal h of the second power module 240, the second power module 240 enters an inactive state and cannot provide the third terminal 3 of the voltage dividing module 230 with the first voltage VA. The enable terminal h of the second power module 240 can be connected to the processing module 210, so that the processing module 210 can control whether the second power module 240 is active or inactive. Alternatively, the enable terminal of the second power module 240 can also be connected to other electronic devices (such as the first power module 220) having processing control functions, so that the other electronic devices can control whether the second power module 240 is active or inactive.

[0131] The communication terminal i of the second power module 240 can be in communication connection with the communication terminal a of the processing module 210 to receive a communication signal. Alternatively, the communication terminal i of the second power module 240 can also be connected to the communication terminal of other electronic devices (such as the first power module 220) having processing control functions to receive a communication signal. The communication connection can be at least one connection through an I2C bus, an SPMI bus, an SPI bus, etc. The communication signal received by the communication terminal i of the second power module 240 can be a second communication signal. The second communication signal can be used to configure the second power module 240, for example, the second power module 240 can adjust the size of the first voltage VA output by the output terminal g according to the second communication signal.

[0132] In other embodiments not shown, the second power module 240 can also be a pulse width modulation (PWM) power supply. A PWM power supply refers to a power supply that controls the output voltage through a PWM signal. For example, the PWM power supply can be a buck DC voltage converter or a boost DC voltage converter. Alternatively, the second power module 240 can also be a programmable power supply.

[0133] III. Circuit structure of the first switch module 250 for floating the input terminal f of the second power module 240.

[0134] As mentioned above, in the embodiment of the present application, the second power module 240 has two states, i.e., working state and non-working state. When the second power module 240 is in the working state, the first voltage VA can be provided to the third terminal 3 of the voltage dividing module 230 to lower or raise the reference voltage input by the input terminal b of the processing module 210. On the contrary, when the second power module 240 is in the non-working state, the first voltage VA cannot be provided to the third terminal 3 of the voltage dividing module 230, and at this time, the value of the reference voltage input by the input terminal b of the processing module 210 is equal to the preset voltage value.

[0135] Taking the case that the first voltage VA is used to lower the reference voltage input by the input terminal b of the processing module 210 as an example, in the embodiment of the present application, the power supply circuit 20 can control whether the second power module 240 is in the working state according to the power consumption of the processing module 210. For example, when the electronic device is in the game scenario, the power consumption of the processing module 210 is high, at this time, a high-level signal can be input to the enable terminal h of the second power module 240 to make the second power module 240 enter the working state, thereby lowering the reference voltage input by the input terminal b of the processing module 210. When the electronic device is in the standby scenario, the power consumption of the processing module 210 is low, at this time, a low-level signal can be input to the enable terminal h of the second power module 240 to make the second power module 240 enter the non-working state. Similarly, when the first voltage VA is used to raise the reference voltage input by the input terminal b of the processing module 210, the power consumption of the processing module 210 can also be used to control whether the second power module 240 is in the working state.

[0136] Figure 15 is an equivalent circuit diagram of the power supply circuit 20 provided by the embodiment of the present application, in which the impedance of the output terminal g of the second power supply module 240 to ground is equivalent to a resistor RG. It has been found through research that, in the related art, when the enable terminal h of the second power supply module 240 inputs a low-level signal, the second power supply module 240 enters an inactive state, and the input terminal f of the second power supply module 240 is left floating, the impedance of the output terminal g of the second power supply module 240 to ground is high impedance (about 200KΩ). The "input terminal f of the second power supply module 240 is left floating" means that the input terminal f of the second power supply module 240 does not input a voltage. When the enable terminal h of the second power supply module 240 inputs a low-level signal, the second power supply module 240 enters an inactive state, and the input terminal f of the second power supply module 240 inputs a voltage, the impedance of the output terminal g of the second power supply module 240 to ground is low impedance (about 100Ω to 500Ω). In this case, on the one hand, a leakage path is formed from the input terminal b of the processing module 210, through the first resistor R1, the second resistor R2, the output terminal g of the second power supply module 240, to the ground. This leakage path is indicated in Figure 15. On the other hand, it also causes the voltage of the feedback terminal e of the first power supply module 220 to be less than the voltage of the input terminal b of the processing module 210. In this case, when the value of the voltage of the feedback terminal e of the first power supply module 220 is equal to the preset voltage value, the value of the voltage of the input terminal b of the processing module 210 is greater than the preset voltage value, i.e. the reference voltage input by the input terminal b of the processing module 210 is raised, resulting in waste of electrical energy.

[0137] Taking the resistance value of the first resistor R1 as 100Ω, the resistance value of the second resistor R2 as 10KΩ, the resistance value of the resistor RG as 500Ω when it is low impedance, and the preset voltage value as 1V as an example, it can be obtained that, when the voltage of the input terminal b of the processing module 210 is 1V, the voltage of the feedback terminal e of the first power supply module 220 is:

[0138] wherein R G is the resistance value of the resistor RG. That is, when the value of the voltage of the input terminal b of the processing module 210 is equal to the preset voltage value, the value of the voltage of the feedback terminal e of the first power supply module 220 is only about 990.6mV, which is 9.4mV less than the preset voltage value. In this case, the first power supply module 220 will continue to increase the voltage output to the input terminal b of the processing module 210 until the value of the voltage of the feedback terminal e of the first power supply module 220 is 1V. When the value of the voltage of the feedback terminal e of the first power supply module 220 is 1V, the voltage of the input terminal b of the processing module 210 is:

[0139] It can be obtained that V1=Vb≈1.0095.

[0140] That is, when the voltage value of the feedback end e of the first power module 220 is equal to the preset voltage value, the voltage value of the input end b of the processing module 210 is about 9.5mV greater than the preset voltage value, that is, the reference voltage is lifted by 9.5mV. This results in a large waste of electric energy.

[0141] When the resistance RG is high impedance with a resistance value of 200KΩ, when the voltage value of the feedback end e of the first power module 220 is 1V, the voltage of the input end b of the processing module 210 is:

[0142] It can be obtained that V1=Vb≈1.000476.

[0143] That is, when the resistance RG is high impedance, and the voltage value of the feedback end e of the first power module 220 is equal to the preset voltage value, the voltage value of the input end b of the processing module 210 is only about 0.476mV greater than the preset voltage value, that is, the reference voltage is lifted by only 0.476mV, and there is almost no waste of electric energy.

[0144] Therefore, when the enable end h of the second power module 240 inputs a low-level signal, and the second power module 240 enters a non-working state, it is necessary to make the impedance of the output end g of the second power module 240 to ground high impedance. In the embodiment of the present application, in order to realize that the impedance of the output end g of the second power module 240 to ground is high impedance, the input end f of the second power module 240 can be left floating, that is, the input end f of the second power module 240 does not input the second voltage VB. Therefore, as shown in FIG. 16, the power supply circuit 20 can further include a first switch module 250.

[0145] The first switch module 250 has a first end j, a second end k and a control end m. The first end j of the first switch module 250 is used to input the second voltage VB. The second end k of the first switch module 250 is connected with the input end f of the second power module 240. In this way, when the first switch module 250 is turned on, that is, the first end j and the second end k of the first switch module 250 are turned on, the input end f of the second power module 240 inputs the second voltage VB. When the first switch module 250 is turned off, that is, the first end j and the second end k of the first switch module 250 are turned off, the input end f of the second power module 240 does not input the second voltage VB, and at this time the input end f of the second power module 240 is left floating. Here, the control end m of the first switch module 250 can be connected with the processing module 210, so that the processing module 210 can control the turn-on and turn-off of the first switch module 250. Alternatively, the control end m of the first switch module 250 can also be connected with other electronic devices with processing control function, so that the other electronic devices control the turn-on and turn-off of the first switch module 250.

[0146] The circuit structure of the first switch module 250 is described in detail below from two possible embodiments.

[0147] 1. In the first possible embodiment, the first switch module 250 only includes the first switch unit 252.

[0148] FIG. 17 is a circuit structure diagram of a first switch module 250 according to an embodiment of the present application. As shown in FIG. 17, the first switch module 250 can only include the first switch unit 252. The first switch unit 252 is an electrical unit for controlling whether the input end f of the second power module 240 inputs the second voltage VB.

[0149] Here, the first end of the first switch unit 252, i.e., the first end j of the first switch module 250, is used to input the second voltage VB. The second end of the first switch unit 252, i.e., the second end k of the first switch module 250, is connected to the input end f of the second power module 240. The control end of the first switch unit 252, i.e., the control end m of the first switch module 250.

[0150] In some specific embodiments, the first switch unit 252 includes a first transistor Q1 and a third resistor R3. The transistor can be a three-terminal switching device such as a field effect transistor (FET), a thyristor, etc. For example, the transistor can be a metal oxide semiconductor field effect transistor (MOSFET), which includes an N-type MOSFET and a P-type MOSFET.

[0151] The first pole of the first transistor Q1 is used to input the second voltage VB. That is, the first pole of the first transistor Q1 is the first end j of the first switch module 250. The second pole of the first transistor Q1 is connected to the input end f of the second power module 240. That is, the second pole of the first transistor Q1 is the second end k of the first switch module 250. The first end of the third resistor R3 is connected to the first pole of the first transistor Q1, and the second end of the third resistor R3 is connected to the control pole of the first transistor Q1.

[0152] In this embodiment, the first transistor Q1 can be controlled to be turned on or off between the first electrode and the second electrode by inputting different level signals to the control electrode of the first transistor Q1. For example, when the first transistor Q1 is a P-type transistor as shown in FIG. 17, the first transistor Q1 can be controlled to be turned on, i.e., controlled to be turned on between the first electrode and the second electrode, by inputting a low level signal to the control electrode of the first transistor Q1; the first transistor Q1 can be controlled to be turned off, i.e., controlled to be turned off between the first electrode and the second electrode, by inputting a high level signal to the control electrode of the first transistor Q1. In this embodiment, the first transistor Q1 can also be controlled to be turned off by controlling the control electrode of the first transistor Q1 to be in a high impedance state, so that the first electrode and the control electrode of the first transistor Q1 are at the same potential, and the first transistor Q1 is turned off, which will not be described herein. In other embodiments not shown, the first transistor Q1 can also be an N-type transistor. In this case, the first transistor Q1 can be controlled to be turned on by inputting a high level signal to the control electrode of the first transistor Q1; the first transistor Q1 can be controlled to be turned off by inputting a low level signal to the control electrode of the first transistor Q1.

[0153] 2. In a second possible embodiment, the first switch module 250 includes a first switch unit 252 and a first level conversion unit 254.

[0154] FIG. 18 is a circuit structure diagram of another first switch module 250 provided by an embodiment of the present application. As shown in FIG. 18, the first switch module 250 can include, on the basis of the first switch unit 252, the first level conversion unit 254.

[0155] Here, the first end of the first switch unit 252 is used to input the second voltage VB. That is, the first end of the first switch unit 252 is the first end j of the first switch module 250. The second end of the first switch unit 252 is connected with the input end f of the second power supply module 240. That is, the second end of the first switch unit 252 is the second end k of the first switch module 250. The first switch unit 252 is an electrical unit used to control whether the input end f of the second power supply module 240 inputs the second voltage VB.

[0156] The output end of the first level conversion unit 254 is connected with the control end of the first switch unit 252. The input end of the first level conversion unit 254 is the control end m of the first switch module 250, which is used to be connected with the processing module 210 or other electronic devices with processing control function. The first level conversion unit 254 is an electrical unit for high-low level signal conversion. That is, when the input end of the first level conversion unit 254 is a high-level signal, the output end of the first level conversion unit 254 is a low-level signal; when the input end of the first level conversion unit 254 is a low-level signal, the output end of the first level conversion unit 254 is a high-level signal.

[0157] In some specific embodiments, the circuit structure of the first switch unit 252 can be the same as that shown in FIG. 17, which will not be repeated. Among them, the first transistor Q1 can be a P-type transistor with low-level conduction and high-level shutdown. Based on this, the first switch module 250 can further include a second transistor Q2 and a fourth resistor R4. The first pole of the second transistor Q2 is connected with the control pole of the first transistor Q1. That is, the first pole of the second transistor Q2 is the output end of the first level conversion unit 254. The second pole of the second transistor Q2 is connected with the ground wire. The control pole of the second transistor Q2 is the input end of the first level conversion unit 254. The first end of the fourth resistor R4 is connected with the second pole of the second transistor Q2, and the second end of the fourth resistor R4 is connected with the control pole of the second transistor Q2.

[0158] In this embodiment, the second transistor Q2 is an N-type transistor with low-level shutdown and high-level conduction. When the control pole of the second transistor Q2 inputs a high-level signal, the second transistor Q2 is turned on. At this time, the control pole of the first transistor Q1 is connected with the ground wire through the second transistor Q2, that is, the control pole of the first transistor Q1 inputs a low-level signal, and the first pole and the second pole of the first transistor Q1 are connected. When the control pole of the second transistor Q2 inputs a low-level signal, the second transistor Q2 is turned off. At this time, the control pole of the first transistor Q1 inputs the second voltage VB through the third resistor R3, that is, the control pole of the first transistor Q1 inputs a high-level signal, and the first pole and the second pole of the first transistor Q1 are disconnected.

[0159] It can be seen that the first switch module 250 shown in FIG. 18 is turned on between the first terminal j and the second terminal k when a high-level signal is input to the control terminal m, and is turned off between the first terminal j and the second terminal k when a low-level signal is input to the control terminal m. As known from the foregoing description, the second power supply module 240 enters the working state when a high-level signal is input to the enable terminal h of the second power supply module 240, and enters the non-working state when a low-level signal is input to the enable terminal h of the second power supply module 240. Based on this, as shown in FIG. 19, the control terminal m of the first switch module 250 and the enable terminal h of the second power supply module 240 can be connected together, so that the first switch module 250 and the second power supply module 240 are simultaneously controlled by one level signal. In addition, in this embodiment, the first transistor Q1 is turned on when the control electrode of the first transistor Q1 is connected to the ground through the second transistor Q2, which can protect the first transistor Q1 from being burned by a large voltage.

[0160] It can be easily understood that, in this embodiment, the first switch module 250 is arranged to prevent the generation of the leakage path shown in FIG. 15 (the output terminal g of the second power supply module 240 is considered to be open when the impedance of the output terminal g to the ground is high, and in this case, the leakage path shown in FIG. 15 is considered not to exist) when the second power supply module 240 does not need to provide the first voltage VA to the third terminal 3 of the voltage dividing module 230. In the embodiments of the present application, the purpose of preventing the generation of the leakage path when the second power supply module 240 does not need to provide the first voltage VA to the third terminal 3 of the voltage dividing module 230 can also be achieved by the following scheme: the processing module 210 or other electronic devices with processing control functions transmits a third communication signal to the second power supply module 240 through the communication terminal i of the second power supply module 240. The third communication signal is used to control the output impedance of the output terminal g of the second power supply module 240 to be high. That is, when the input terminal f of the second power supply module 240 inputs the second voltage VB, and the enable terminal h of the second power supply module 240 inputs a high-level signal and the second power supply module 240 enters the working state, if the communication terminal i of the second power supply module 240 inputs the third communication signal, the output impedance of the output terminal g of the second power supply module 240 is high. In this case, since the output impedance of the output terminal g of the second power supply module 240 is high, on the one hand, the second power supply module 240 cannot provide the first voltage VA to the third terminal 3 of the voltage dividing module 230, and on the other hand, the leakage path shown in FIG. 15 cannot be generated.

[0161] IV. Other circuit structures.

[0162] 1. Setting of the voltage stabilizing capacitor in the power supply circuit 20.

[0163] In the embodiment of the present application, in order to input a stable reference voltage to the input end b of the processing module 210, the first voltage VA input to the third end 3 of the voltage dividing module 230 should have a small ripple. Based on this, a voltage stabilizing capacitor can be arranged at the input end f and the output end g of the second power supply module 240.

[0164] As shown in FIG. 20, in some embodiments, the power supply circuit 20 includes a first capacitor C1, which is a voltage stabilizing capacitor arranged at the input end f of the second power supply module 240. In the embodiment of the present application, when the power supply circuit 20 includes the first switch module 250, the first plate of the first capacitor C1 is connected to the first end j of the first switch module 250, and the second plate of the first capacitor C1 is connected to the ground. That is, the first capacitor C1 is connected to the input end f of the second power supply module 240 through the first switch module 250.

[0165] It is easy to understand that, in the case where the first capacitor C1 is directly connected to the input end f of the second power supply module 240, i.e., the first plate of the first capacitor C1 is connected to the second end k of the first switch module 250 and the input end f of the second power supply module 240, when the second power supply module 240 enters the non-working state from the working state and the first switch module 250 switches from the on state to the off state, the presence of the first capacitor C1 will make the input end f of the second power supply module 240 unable to be suspended, thereby causing the leakage path shown in FIG. 15. Based on this, in the embodiment of the present application, the first capacitor C1 is connected to the input end f of the second power supply module 240 through the first switch module 250. In this way, when the first switch module 250 is off, the input end f of the second power supply module 240 can immediately enter the suspended state without being affected by the first capacitor C1.

[0166] In some embodiments, the power supply circuit 20 includes a second capacitor C2, which is a voltage stabilizing capacitor arranged at the output end g of the second power supply module 240. The first plate of the second capacitor C2 is connected to the output end g of the second power supply module 240, and the second plate of the second capacitor C2 is connected to the ground.

[0167] 2. Circuit structure of the second switch module 260 for preventing the generation of the leakage path shown in FIG. 15.

[0168] As described above, the first switch module 250 functions to: when the enable terminal h of the second power module 240 inputs a high level signal, the second power module 240 enters a working state, and is turned on, so that the input terminal f of the second power module 240 inputs the second voltage VB through the first switch module 250, thereby outputting the first voltage VA to the third terminal 3 of the voltage dividing module 230; when the enable terminal h of the second power module 240 inputs a low level signal, the second power module 240 enters a non-working state, and is turned off, so that the input terminal f of the second power module 240 is suspended, thereby making the impedance of the output terminal g of the second power module 240 to ground high. In some embodiments, as shown in FIG. 21, the power supply circuit 20 can also include a second switch module 260. The second switch module 260 functions to: when the second power module 240 enters a working state, it is turned on, so that the output terminal g of the second power module 240 outputs the first voltage VA to the third terminal 3 of the voltage dividing module 230 through the second switch module 260; when the second power module 240 enters a non-working state, it is turned off, so as to cut off the leakage path shown in FIG. 15.

[0169] The second switch module 260 has a first terminal n, a second terminal p, and a control terminal q. The first terminal n of the second switch module 260 is connected with the output terminal g of the second power module 240, and the second terminal p of the second switch module 260 is connected with the third terminal 3 of the voltage dividing module 230. In this way, when the second switch module 260 is turned on, i.e. when the first terminal n and the second terminal p of the second switch module 260 are turned on, the output terminal g of the second power module 240 is connected with the third terminal 3 of the voltage dividing module 230, so that the output terminal g of the second power module 240 can output the first voltage VA to the third terminal 3 of the voltage dividing module 230 through the second switch module 260. When the second switch module 260 is turned off, i.e. when the first terminal n and the second terminal p of the second switch module 260 are turned off, the output terminal g of the second power module 240 is not connected with the third terminal 3 of the voltage dividing module 230, so as to cut off the leakage path and avoid waste of electric energy. Here, the control terminal q of the second switch module 260 can be connected with the processing module 210, so that the processing module 210 can control the turn-on and turn-off of the second switch module 260. Alternatively, the control terminal q of the second switch module 260 can also be connected with other electronic devices having processing control functions, so that the other electronic devices control the turn-on and turn-off of the second switch module 260.

[0170] FIG. 22 is a circuit structure diagram of a second switch module 260 according to an embodiment of the present application. As shown in FIG. 22, in a possible embodiment, the second switch module 260 only includes a second switch unit 262. The second switch unit 262 includes a third transistor Q3 and a fifth resistor R5. The first pole of the third transistor Q3 is connected with the output end g of the second power supply module 240, and the second pole of the third transistor Q3 is connected with the third end 3 of the voltage division module 230. The first end of the fifth resistor R5 is connected with the first pole of the third transistor Q3, and the second end of the fifth resistor R5 is connected with the control pole of the third transistor Q3. The third transistor Q3 can be a P-type transistor as shown in FIG. 22, or can be an N-type transistor. It can be understood that the circuit structure and conduction principle of the second switch module 260 shown in FIG. 22 are the same as those of the first switch module 250 shown in FIG. 17, and will not be described herein again.

[0171] In another possible embodiment, as shown in FIG. 23, the second switch module 260 includes the second switch unit 262 and a second level conversion unit 264. The third transistor Q3 in the second switch unit 262 is a P-type transistor. The second level conversion unit 264 includes a fourth transistor Q4 and a sixth resistor R6. The first pole of the fourth transistor Q4 is connected with the control pole of the third transistor Q3. The second pole of the fourth transistor Q4 is connected with the ground wire. The first end of the sixth resistor R6 is connected with the second pole of the fourth transistor Q4, and the second end of the sixth resistor R6 is connected with the control pole of the fourth transistor Q4. The fourth transistor Q4 is an N-type transistor. It can be understood that the circuit structure and conduction principle of the second switch module 260 shown in FIG. 23 are the same as those of the first switch module 250 shown in FIG. 18, and will not be described herein again.

[0172] The second switch module 260 shown in FIG. 23 is turned on between the first end n and the second end p when a high-level signal is input to the control end q, and is turned off between the first end n and the second end p when a low-level signal is input to the control end q. Based on this, when the circuit structure of the second switch module 260 is as shown in FIG. 23, the control end q of the second switch module 260 and the enable end h of the second power supply module 240 can be connected together, so as to control the second switch module 260 and the second power supply module 240 by one level signal.

[0173] It can be understood that, in the embodiments of the present application, the power supply circuit 20 can only include any one of the first switch module 250 and the second switch module 260, or can include both the first switch module 250 and the second switch module 260. In some other embodiments, if the third communication signal can be transmitted to the communication end i of the second power supply module 240, and the output impedance of the output end g of the second power supply module 240 is adjusted to be high impedance through the third communication signal, the power supply circuit 20 can also not include the first switch module 250 and the second switch module 260.

[0174] 3. Other optional circuit structures.

[0175] FIG. 24 is a circuit structure diagram of another power supply circuit 20 provided by the embodiments of the present application. As shown in FIG. 24, in the embodiments of the present application, the output end d of the first power supply module 220 can include a plurality of sub-ports, and each of the plurality of sub-ports can be connected to the first end of the PDN through an inductor. That is, the plurality of sub-ports are collectively used to supply power to the processing module 210. Here, the plurality of refers to two or more integers. For example, in the embodiment shown in FIG. 24, the output end d of the first power supply module 220 includes a sub-port d1, a sub-port d2, and a sub-port d3. The power supply circuit 20 further includes a first inductor L1, a second inductor L2, and a third inductor L3. The sub-port d1 corresponds to the first inductor L1, the first end of the first inductor L1 is connected to the sub-port d1, and the second end of the first inductor L1 is connected to the input end of the processing module 210 through the PDN. The sub-port d2 corresponds to the second inductor L2, the first end of the second inductor L2 is connected to the sub-port d2, and the second end of the second inductor L2 is connected to the input end of the processing module 210 through the PDN. The sub-port d3 corresponds to the third inductor L3, the first end of the third inductor L3 is connected to the sub-port d3, and the second end of the third inductor L3 is connected to the input end of the processing module 210 through the PDN. In this way, the first power supply module 220 can supply power to the processing module 210 through a plurality of inductors. It is easy to understand that the current drawn by the processing module 210 during operation is large, and therefore if the first power supply module 220 supplies power to the processing module 210 through one inductor, the inductor needs to have a large maximum current value. An inductor with a large maximum current value usually occupies a large area and volume, which is not conducive to the integration of the power supply circuit 20. Based on this, in the embodiments of the present application, the first power supply module 220 can supply power to the processing module 210 through a plurality of inductors, which can reduce the current flowing through each inductor during operation of the processing module 210, thereby reducing the maximum current value of each inductor, reducing the area and volume occupied by the inductor, and facilitating heat dissipation of the inductor. The maximum current value of the inductor refers to the maximum current value that can ensure normal operation of the inductor, that is, when the current in the inductor exceeds the maximum current value, the inductor cannot work normally.

[0176] Generally, as shown in FIG. 25, the first power supply module 220 can include a control unit and a plurality of voltage conversion units. Each of the plurality of voltage conversion units is configured to perform direct current voltage conversion. The number of the plurality of voltage conversion units is the same as the number of the sub-ports of the output end d of the first power supply module 220. The plurality of voltage conversion units correspond to the plurality of sub-ports one by one. Each voltage conversion unit outputs electric energy through the corresponding sub-port. The control unit is configured to control each voltage conversion unit in the plurality of voltage conversion units. Here, the control logic of the control unit for each voltage conversion unit can be the same. That is, the working process of the first power supply module 220 is as follows: when the control unit receives a preset voltage value, the control unit controls each voltage conversion unit to output a reference voltage from the corresponding sub-port to the input end b of the processing module 210, thereby supplying power to the processing module 210; during the process of supplying power to the processing module 210, the reference voltage output by each voltage conversion unit to the input end b of the processing module 210 is adjusted according to the voltage of the feedback end e of the first power supply module 220, so that the value of the voltage of the feedback end e of the first power supply module 220 is equal to the preset voltage value.

[0177] As shown in FIG. 25, the power supply module 120 is internally provided with a series connection of a resistor Ra and a resistor Rb. The resistor Ra and the resistor Rb are voltage division sampling resistors, and the resistor Ra and the resistor Rb are connected in series between the feedback end e and the ground. The resistor Ra and the resistor Rb are connected to a node A. The control unit can obtain the value of the voltage of the feedback end e by detecting the voltage value of the node A and according to the ratio of the resistance values of the resistor Ra and the resistor Rb.

[0178] The power supply circuit 20 and the application scenarios provided by the embodiments of the present application will be explained in detail in three different cases of one specific embodiment in combination with the accompanying drawings.

[0179] As shown in FIG. 24 or FIG. 25, the power supply circuit 20 can include a processing module 210, a first power supply module 220, a PDN, a voltage division module 230, a second switch module 260, a second power supply module 240, a first switch module 250, a first capacitor C1 and a second capacitor C2. The first switch module 250 includes a first switch unit 252 and a first level conversion unit 254, and the control end m of the first switch module 250 and the enable end h of the second power supply module 240 are connected together and controlled by one level signal. The second switch module 260 only includes a second switch unit 262, and the second switch unit 262 is controlled by another level signal.

[0180] In the following description, the enable end h of the second power module 240, the control end m of the first switch module 250, and the control end q of the second switch module 260 are connected with the processing module 210, so that the processing module 210 can control whether the second power module 240 works, whether the first switch module 250 is turned on or turned off, and whether the second switch module 260 is turned on or turned off. In the following description, the communication end i of the second power module 240 is in communication connection with the processing module 210, so that the processing module 210 can adjust the size of the first voltage VA output by the output end g of the second power module 240 through the second communication signal. In the following description, the preset voltage value is 1V.

[0181] The power supply circuit 20 can be applied to the following three different working scenarios.

[0182] 1. The reference voltage input by the processing module 210 is low, so that the actual voltage input by the input end b of the processing module 210 is less than the first voltage threshold Vth1 when the processing module 210 works.

[0183] For electronic devices with large PDN impedance, the reference voltage input by the processing module 210 may be low. When the processing module 210 works, if the actual voltage input by the input end b is less than the first voltage threshold Vth1, the processing module 210 cannot work normally. On the electronic device to which the power supply circuit 20 is applied, it is manifested as that the electronic device is dead. Based on this, in this scenario, the power supply circuit 20 can raise the reference voltage input by the input end b of the processing module 210.

[0184] Specifically, when the processing module 210 is powered on, it can transmit a preset voltage value to the first power module 220 through the communication end a. During the process in which the first power module 220 supplies power to the processing module 210, if the processing module 210 detects that the reference voltage input by the input end b is low, then:

[0185] Firstly, the processing module 210 inputs a high-level signal to the enable end h of the second power module 240 and the control electrode of the second transistor Q2, so as to control the second power module 240 to enter a working state and the second transistor Q2 to be turned on. When the second transistor Q2 is turned on, the first transistor Q1 is turned on. Secondly, the processing module 210 inputs a low-level signal to the control electrode of the third transistor Q3, so as to control the third transistor Q3 to be turned on. Thirdly, the processing module 210 transmits a second communication signal to the communication end i of the second power module 240, so as to adjust the value of the first voltage VA output by the output end g of the second power module 240 to 0.5V.

[0186] In this case, the input end f of the second power module 240 inputs the second voltage VB through the first transistor Q1, and the output end g of the second power module 240 outputs the first voltage VA of 0.5V to the third end of the voltage dividing module 230 through the third transistor Q3. Under the voltage dividing effect of the first resistor R1 and the second resistor R2, when the voltage of the second end of the voltage dividing module 230 is equal to 1V, the voltage of the first end of the voltage dividing module 230 must be greater than 1V, that is, the value of the reference voltage input by the input end b of the processing module 210 is greater than 1V. In this way, the reference voltage input by the input end b of the processing module 210 can be raised.

[0187] 2. The reference voltage input by the processing module 210 is relatively high, and the processing module 210 itself has high power consumption.

[0188] The reference voltage input by the processing module 210 is relatively high refers to the case of the reference voltage input by the processing module 210 after the PDN impedance is optimized. The processing module 210 itself has high power consumption refers to that the processing module 210 needs to process more data. In terms of the electronic device to which the power supply circuit 20 is applied, the processing module 210 itself has high power consumption when the electronic device is in a state of playing, multiple application programs (APP) running simultaneously, navigation, etc. Based on this, in this scenario, the power supply circuit 20 can reduce the reference voltage input by the input end b of the processing module 210.

[0189] Specifically, when the processing module 210 is powered on, a preset voltage value can be transmitted to the first power module 220 through the communication end a. During the process of the first power module 220 supplying power to the processing module 210, if the processing module 210 detects that the reference voltage input by the input end b is relatively high and needs to process more data, then:

[0190] Firstly, the processing module 210 inputs a high-level signal to the enable end h of the second power module 240 and the control electrode of the second transistor Q2, so as to control the second power module 240 to enter a working state and the second transistor Q2 to be turned on. When the second transistor Q2 is turned on, the first transistor Q1 is turned on. Secondly, the processing module 210 inputs a low-level signal to the control electrode of the third transistor Q3, so as to control the third transistor Q3 to be turned on. Thirdly, the processing module 210 transmits a second communication signal to the communication end i of the second power module 240, so as to adjust the value of the first voltage VA output by the output end g of the second power module 240 to 3V.

[0191] In this case, the input end f of the second power module 240 inputs the second voltage VB through the first transistor Q1, and the output end g of the second power module 240 outputs the first voltage VA of 3V to the third end of the voltage dividing module 230 through the third transistor Q3. Under the voltage dividing effect of the first resistor R1 and the second resistor R2, when the voltage of the second end of the voltage dividing module 230 is equal to 1V, the voltage of the first end of the voltage dividing module 230 must be less than 1V, that is, the value of the reference voltage input by the input end b of the processing module 210 is less than 1V. In this way, the reduction of the reference voltage input by the input end b of the processing module 210 can be realized.

[0192] In the above two working scenarios, the second power module 240 is in the working state. The circuit composed of the second power module 240, the first switch module 250 and the second switch module 260 is in the active state.

[0193] 3. The reference voltage input by the processing module 210 is high, but the processing module 210 itself has low power consumption.

[0194] The low power consumption of the processing module 210 itself means that the processing module 210 needs to process less data. In terms of the electronic device to which the power supply circuit 20 is applied, when the electronic device is in a standby state, a program is not running, or the like, the processing module 210 itself has low power consumption. It is easy to understand that when the second power module 240 is in the working state, the second power module 240, the first switch module 250 and the second switch module 260 will also generate certain power consumption. Therefore, when the processing module 210 itself has low power consumption, the processing module 210 can control the second power module 240 to be in the non-working state, and control the first switch module 250 and the second switch module 260 to be turned off, so as to avoid waste of electric energy. In this case, there are:

[0195] Firstly, the processing module 210 inputs a low-level signal to the enable end h of the second power module 240 and the control electrode of the second transistor Q2, so as to control the second power module 240 to enter the non-working state, and the second transistor Q2 is turned off. When the second transistor Q2 is turned off, the first transistor Q1 is turned off. Secondly, the processing module 210 inputs a high-level signal to the control electrode of the third transistor Q3, so as to control the third transistor Q3 to be turned off.

[0196] In this working scenario, the second power module 240 is in an inactive state. The circuit composed of the second power module 240, the first switch module 250 and the second switch module 260 is in an inactive bypass state. In this working scenario, since the third end 3 of the voltage dividing module 230 has no input voltage, the voltage at the first end 1 and the second end 2 of the voltage dividing module 230 is the same without considering the leakage current, which makes the value of the voltage at the feedback end e of the first power module 220 equal to the value of the voltage at the input end b of the processing module 210, i.e. V2=Ve=V1=Vb.

[0197] It is easy to understand that the self-power consumption of the processing module 210 is generally related to its working frequency. Based on this, the processing module 210 can obtain its self-power consumption by detecting its working frequency, and judge the high or low of its self-power consumption accordingly. In the embodiments of the present application, the judgment standard of the high or low of the self-power consumption of the processing module 210, and the judgment condition of the processing module 210 adjusting the value of the first voltage VA output by the output end g of the second power module 240 can be set by those skilled in the art according to the specific parameters of the power supply circuit 20 and the different scenarios of the electronic device.

[0198] The power supply circuit 20 provided by the embodiments of the present application has at least the following beneficial effects: (1) Based on the setting of the voltage dividing module 230, the reference voltage input by the input end b of the processing module 210 can be reduced, thereby saving power consumption. Alternatively, based on the setting of the voltage dividing module 230, the reference voltage input by the input end b of the processing module 210 can be increased, thereby improving system stability. (2) The LDO is used as the second power supply module 240, which can provide the third end 3 of the voltage dividing module 230 with a stable first voltage VA with small ripple. (3) By setting the first switch module 250, when the second power supply module 240 enters the non-working state, the input end f of the second power supply module 240 is suspended, so that the impedance of the output end g of the second power supply module 240 to the ground is high impedance. (4) By setting the second switch module 260, when the second power supply module 240 enters the non-working state, the leakage path in the power supply circuit 20 is cut off, thereby avoiding waste of electric energy. (5) The output impedance of the output end g of the second power supply module 240 can be controlled to be high impedance by transmitting the third communication signal to the communication end i of the second power supply module 240, thereby preventing the generation of the leakage path. (6) The increase or decrease of the reference voltage is not dependent on the resistance Ra and the resistance Rb in the first power supply module 120 in the related art. In the case where the voltage dividing module 230 only includes the first resistance R1 and the second resistance R2, i.e., the voltage dividing module 230 does not introduce capacitors, inductors and other devices, the voltage dividing module 230 will not cause the change of the zero-pole in the circuit, and will not affect the transfer function of the power supply circuit 20. (7) The improvement of the processing module 210 and the first power supply module 220 is not involved, so that the whole scheme is easier to implement and has lower cost. (8) By adding the voltage dividing module 230 and the second power supply module 240 between the first power supply module 120 and the processing module 110 in the related art, the reference voltage is increased or decreased, and the response speed is fast. (9) Whether the second power supply module 240 is in the working state or not, the stability of the circuit between the processing module 210 and the first power supply module 220 is not affected.

[0199] The embodiments of the present application also provide an electronic device comprising the power supply circuit 20 in any one of the above embodiments.

[0200] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit comprises a processing module, a first power supply module and a voltage dividing module. The communication end of the processing module is connected with the communication end of the first power supply module, and the processing module is configured to transmit a communication signal to the first power supply module at power-on, the communication signal being configured to indicate a preset voltage value; the output end of the first power supply module is connected with the input end of the processing module to supply power to the processing module. The first end of the voltage dividing module is connected with the input end of the processing module, the second end of the voltage dividing module is connected with the feedback end of the first power supply module, and the third end of the voltage dividing module is configured to input a first voltage; the voltage value of the second end of the voltage dividing module is between the voltage value of the first end of the voltage dividing module and the voltage value of the third end of the voltage dividing module, and the voltage value of the second end of the voltage dividing module is positively correlated with the voltage value of the first end of the voltage dividing module. The first power supply module is configured to adjust the reference voltage output to the input end of the processing module according to the voltage of the feedback end, so that the value of the voltage of the feedback end is equal to the preset voltage value.

2. The power supply circuit of claim 1, wherein, The voltage dividing module comprises a first resistor and a second resistor. The first end of the first resistor is connected with the input end of the processing module, the second end of the first resistor is connected with the first end of the second resistor and the feedback end of the first power supply module, and the second end of the second resistor is configured to input the first voltage.

3. The power supply circuit of claim 2, wherein, The resistance value of the first resistor is greater than or equal to 10 ohms, and the resistance value of the first resistor is less than or equal to 100 ohms. The resistance value of the second resistor is greater than or equal to 1 kilo-ohm.

4. The power supply circuit according to any one of claims 1 to 3, wherein The power supply circuit further comprises a second power supply module. The input end of the second power supply module is configured to input a second voltage, and the output end of the second power supply module is connected with the third end of the voltage dividing module to output the first voltage to the third end of the voltage dividing module.

5. The power supply circuit of claim 4, wherein, The second power supply module comprises a linear voltage regulator.

6. A power supply circuit as claimed in claim 4 or 5, characterized in that, The power supply circuit further comprises a first switch module. The first end of the first switch module is configured to input the second voltage, and the second end of the first switch module is connected with the input end of the second power supply module.

7. The power supply circuit of claim 6, wherein, The first switch module comprises a first transistor and a third resistor. The first pole of the first transistor is configured to input the second voltage, and the second pole of the first transistor is connected with the input end of the second power supply module. The first end of the third resistor is connected with the first pole of the first transistor, and the second end of the third resistor is connected with the control pole of the first transistor.

8. The power supply circuit of claim 7, wherein, The first transistor is a P-type transistor. The first switch module further comprises a second transistor and a fourth resistor. The first pole of the second transistor is connected with the control pole of the first transistor, the second pole of the second transistor is connected with a ground wire, and the second transistor is an N-type transistor. The first end of the fourth resistor is connected with the second pole of the second transistor, and the second end of the fourth resistor is connected with the control pole of the second transistor. The power supply circuit further comprises a first capacitor.

9. A power supply circuit as claimed in any one of claims 6 to 8, characterized in that, ​ The first plate of the first capacitor is connected with the first end of the first switch module, and the second plate of the first capacitor is connected with the ground wire.

10. A power supply circuit as claimed in any one of claims 4 to 9, characterized in that, The power supply circuit further comprises a second capacitor. The first plate of the second capacitor is connected with the output end of the second power module, and the second plate of the second capacitor is connected with the ground wire.

11. A power supply circuit as claimed in any one of claims 4 to 10, characterized in that, The power supply circuit further comprises a second switch module. The first end of the second switch module is connected with the output end of the second power module, and the second end of the second switch module is connected with the third end of the voltage division module.

12. The power supply circuit of claim 11, wherein, The second switch module comprises a third transistor and a fifth resistor. The first pole of the third transistor is connected with the output end of the second power module, and the second pole of the third transistor is connected with the third end of the voltage division module. The first end of the fifth resistor is connected with the first pole of the third transistor, and the second end of the fifth resistor is connected with the control pole of the third transistor.

13. The power supply circuit according to any one of claims 1 to 12, wherein The output end of the first power module comprises a plurality of sub-ports; the power supply circuit further comprises a plurality of inductors. The plurality of inductors correspond to the plurality of sub-ports one by one; the first end of any one of the plurality of inductors is connected with the corresponding sub-port, and the second end of each of the plurality of inductors is connected with the input end of the processing module.

14. The power supply circuit according to any one of claims 1 to 13, wherein The power supply circuit further comprises a power distribution network. The first end of the power distribution network is connected with the output end of the first power module, the second end of the power distribution network is connected with the input end of the processing module, and the first power module supplies power to the processing module through the power distribution network.

15. An electronic device, comprising: The power supply circuit comprises the power supply circuit according to any one of claims 1 to 14.

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